Provided is a method of providing a web browsing interface, wherein at least one tab is provided for a content display region, the method including: splitting the tab into at least two spaces based on a space mode of the tab; displaying web pages respectively in the at least two spaces; while the tab is split into the at least two spaces, determining whether the space mode of the tab is a first mode or a second mode; when the space mode is determined to be the first mode, performing a first mode setting operation of setting one of the at least two spaces as a main space, setting a margin on a periphery of the main space, and displaying a web page in a region of the main space excluding the margin.